Improve support for the Federation Extension

[m-mohr]

In the EOEPCA+ project, we made an evaluation of the federation-related functionality available through the openEO Julia client. The Federation Extension can be found here: https://github.com/Open-EO/openeo-api/blob/draft/extensions/federation/README.md

The following issues have been identified for the programatic access in R:

• federation:missing can't be accessed through the corresponding functions for the following endpoints:
  • [ ] GET /collections
  • [ ] GET /processes
  • [ ] GET /process_graphs
  • [ ] GET /files
  • [ ] GET /jobs
  • [ ] GET /jobs/:id/logs
  • [ ] GET /services
  • [ ] GET /services/:id/logs

The following issues have been identified for the programatic access through the UI interfaces such as Jupyter and RMarkdown:

• federation:missing can't be accessed through the corresponding functions for the following endpoints:
  • [ ] GET /collections
  • [ ] GET /processes
  • [ ] GET /file_formats
  • [ ] GET /process_graphs
  • [ ] GET /files
  • [ ] GET /jobs
  • [ ] GET /jobs/:id/logs (missing upstream in Vue Components)
  • [ ] GET /services
  • [ ] GET /services/:id/logs (missing upstream in Vue Components)
• federation:backends can't be accessed through the corresponding functions for the following endpoints:
  • [ ] POST /validation
  • [ ] GET /udf_runtimes per version (missing upstream in Vue Components)
  • [ ] GET /services/{id} (missing upstream in Vue Components)